<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/3_0.txt.                                  |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | license@php.net so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Hartmut Holzgraefe <hholzgra@php.net>                       |
// |          Christian Stocker <chregu@bitflux.ch>                       |
// +----------------------------------------------------------------------+
//

//

/**
 * helper class for parsing LOCK request bodies
 *
 * @package HTTP_WebDAV_Server
 * @author Hartmut Holzgraefe <hholzgra@php.net>
 * @version 0.99.1dev
 */
class _parse_lockinfo
{
    /**
     * success state flag
     *
     * @var bool
     * @access public
     */
    public $success = false;

    /**
     * lock type, currently only "write"
     *
     * @var string
     * @access public
     */
    public $locktype = "";

    /**
     * lock scope, "shared" or "exclusive"
     *
     * @var string
     * @access public
     */
    public $lockscope = "";

    /**
     * lock owner information
     *
     * @var string
     * @access public
     */
    public $owner = "";

    /**
     * flag that is set during lock owner read
     *
     * @var bool
     * @access private
     */
    public $collect_owner = false;

    /**
     * constructor
     *
     * @param  string  path of stream to read
     * @access public
     */
    public function __construct($path)
    {
        // we assume success unless problems occur
        $this->success = true;

        // remember if any input was parsed
        $had_input = false;

        // open stream
        $f_in = fopen($path, 'rb');
        if (!$f_in) {
            $this->success = false;
            return;
        }

        // create namespace aware parser
        $xml_parser = xml_parser_create_ns("UTF-8", " ");

        // set tag and data handlers
        xml_set_element_handler(
            $xml_parser,
            array(&$this, "_startElement"),
            array(&$this, "_endElement")
        );
        xml_set_character_data_handler(
            $xml_parser,
            array(&$this, "_data")
        );

        // we want a case sensitive parser
        xml_parser_set_option(
            $xml_parser,
            XML_OPTION_CASE_FOLDING,
            false
        );

        // parse input
        while ($this->success && !feof($f_in)) {
            $line = fgets($f_in);
            if (is_string($line)) {
                $had_input = true;
                $this->success &= xml_parse($xml_parser, $line, false);
            }
        }

        // finish parsing
        if ($had_input) {
            $this->success &= xml_parse($xml_parser, "", true);
        }

        // check if required tags where found
        $this->success &= !empty($this->locktype);
        $this->success &= !empty($this->lockscope);

        // free parser resource
        xml_parser_free($xml_parser);

        // close input stream
        fclose($f_in);
    }


    /**
     * tag start handler
     *
     * @param  resource  parser
     * @param  string    tag name
     * @param  array     tag attributes
     * @return void
     * @access private
     */
    public function _startElement($parser, $name, $attrs)
    {
        // namespace handling
        if (strstr($name, " ")) {
            list($ns, $tag) = explode(" ", $name);
        } else {
            $ns = "";
            $tag = $name;
        }


        if ($this->collect_owner) {
            // everything within the <owner> tag needs to be collected
            $ns_short = "";
            $ns_attr = "";
            if ($ns) {
                if ($ns == "DAV:") {
                    $ns_short = "D:";
                } else {
                    $ns_attr = " xmlns='$ns'";
                }
            }
            $this->owner .= "<$ns_short$tag$ns_attr>";
        } elseif ($ns == "DAV:") {
            // parse only the essential tags
            switch ($tag) {
            case "write":
                $this->locktype = $tag;
                break;
            case "exclusive":
            case "shared":
                $this->lockscope = $tag;
                break;
            case "owner":
                $this->collect_owner = true;
                break;
            }
        }
    }

    /**
     * data handler
     *
     * @param  resource  parser
     * @param  string    data
     * @return void
     * @access private
     */
    public function _data($parser, $data)
    {
        // only the <owner> tag has data content
        if ($this->collect_owner) {
            $this->owner .= $data;
        }
    }

    /**
     * tag end handler
     *
     * @param  resource  parser
     * @param  string    tag name
     * @return void
     * @access private
     */
    public function _endElement($parser, $name)
    {
        // namespace handling
        if (strstr($name, " ")) {
            list($ns, $tag) = explode(" ", $name);
        } else {
            $ns = "";
            $tag = $name;
        }

        // <owner> finished?
        if (($ns == "DAV:") && ($tag == "owner")) {
            $this->collect_owner = false;
        }

        // within <owner> we have to collect everything
        if ($this->collect_owner) {
            $ns_short = "";
            $ns_attr = "";
            if ($ns) {
                if ($ns == "DAV:") {
                    $ns_short = "D:";
                } else {
                    $ns_attr = " xmlns='$ns'";
                }
            }
            $this->owner .= "</$ns_short$tag$ns_attr>";
        }
    }
}